switching for irridium spark plugs

R

Ricco

New Member
Hello everybody, i intend to switch my L92YC champion spark plugs for irridium ones. I already have experimented that on my old Triumph Bonnie and it works very well (slightly less consumption and better gas burning). But I am turning mad with the different types and classifications .
Finally i have found NGK irridium ones BR6 HIX or BPR6HIX.
Has anyone done it before? What type could you suggest?
Thanks for your help i work on a P6 3500 1970 car.
 
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Ricco said:
Hello everybody, i intend to switch my L92YC champion spark plugs for irridium ones. I already have experimented that on my old Triumph Bonnie and it works very well (slightly less consumption and better gas burning). But I am turning mad with the different types and classifications .
Finally i have found NGK irridium ones BR6 HIX or BPR6HIX.
Has anyone done it before? What type could you suggest?
Thanks for your help i work on a P6 3500 1970 car.
Click to expand...
Ricco,

I'll be blunt, you're waisting your time and money replacing the Champion L92YC plugs for irridium items. A 56 year old engine with carburettors will see no benefit from using them. If your engine was a Rover 4.0 or 4.6 litre V8 with no distributor and a fuel injection system running a 96 degree thermostat, then by all means, but as it stands, don't waste your money seeking gains you will never see.

Ron.
 
I would not expect any improvement in performance with iridium tips, so agree it's a waste of money in that regard. Might see a catalytic benefit in easier starting and less propensity for plugs to foul if you are having difficulty with either of those symptoms...but really just covering up another weakness. Simple to do though, and they should last forever.

Happy Motoring - Munro.
 
SydneyRoverP6B said:
Ricco,

I'll be blunt, you're waisting your time and money replacing the Champion L92YC plugs for irridium items. A 56 year old engine with carburettors will see no benefit from using them. If your engine was a Rover 4.0 or 4.6 litre V8 with no distributor and a fuel injection system running a 96 degree thermostat, then by all means, but as it stands, don't waste your money seeking gains you will never see.

Ron.
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thank you Ron for your answer, which is in the same trend than others. Now i am going to isolate (insulate?) the air flow system with a pipe going from front to filters in the back and the pipes going to carburators.
 
Stuck-in-1972 said:
I would not expect any improvement in performance with iridium tips, so agree it's a waste of money in that regard. Might see a catalytic benefit in easier starting and less propensity for plugs to foul if you are having difficulty with either of those symptoms...but really just covering up another weakness. Simple to do though, and they should last forever.

Happy Motoring - Munro.
Click to expand...
Stuck-in-1972 said:
I would not expect any improvement in performance with iridium tips, so agree it's a waste of money in that regard. Might see a catalytic benefit in easier starting and less propensity for plugs to foul if you are having difficulty with either of those symptoms...but really just covering up another weakness. Simple to do though, and they should last forever.

Happy Motoring - Munro.
Click to expand...
Thank you for your answer. I stop with that and concentrate on how to get fresher air to carburators?
 
Try fresh cooler air...
wLSrw4W.jpeg

Make the inlet to the air cleaner larger (cut it back) and pipe cooler air to it from some where clear of the radiator. Check your plugs for colour - milk coffee is very good, paler is lean, darker is rich.
 
I have the same set of iridium plugs in my 2000 TC since it was a mile muncher everyday car, something like 12 years ago. I fitted this set more out of curiocity, because i understood that they helped in cases that ignition was difficult, i.e. engines running on LPG. My impression is that it my case they helped. Starting and running was more consistend, especially when i did not had the time to have the tuning always spot on. After all those years i forgot about them, but the car still starts easily even if it has some weeks to run, even if the last time it was running on the choke, even when the battery is not fully charged.
I would not bother to fit them though if the car would see only some very occasional use.
 
Demetris said:
I have the same set of iridium plugs in my 2000 TC since it was a mile muncher everyday car, something like 12 years ago. I fitted this set more out of curiocity, because i understood that they helped in cases that ignition was difficult, i.e. engines running on LPG. My impression is that it my case they helped. Starting and running was more consistend, especially when i did not had the time to have the tuning always spot on. After all those years i forgot about them, but the car still starts easily even if it has some weeks to run, even if the last time it was running on the choke, even when the battery is not fully charged.
I would not bother to fit them though if the car would see only some very occasional use.
Click to expand...
Thank you for your answer. I have an occasional use so...
 
jp928 said:
Try fresh cooler air...
wLSrw4W.jpeg

Make the inlet to the air cleaner larger (cut it back) and pipe cooler air to it from some where clear of the radiator. Check your plugs for colour - milk coffee is very good, paler is lean, darker is rich.
Click to expand...
Yess, i have to fund such a pipe. Where did you got it from? I wouldn't hav thought to widen the hole of the filter box. Where goes the other end? Is it free or did you fit a kind of cone? What i am going to add is metal isolating tape on the pipe , the filter box and the pipes to the carburators
Thank you for the pic
 
The pipe runs to the area behind the nearside (LEFT!) headlight, above the horn so it avoids hot air from the radiator. The end is open. Its ~65mm flex hose, sometimes called 'dust extraction hose'.
Try this version
 

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Ricco said:
Yess, i have to fund such a pipe. Where did you got it from? I wouldn't hav thought to widen the hole of the filter box. Where goes the other end? Is it free or did you fit a kind of cone? What i am going to add is metal isolating tape on the pipe , the filter box and the pipes to the carburators
Thank you for the pic
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The SD1 air filter box/canister has a larger inlet port. Just sayin. If you dont want to hack your P6 airbox.
 
colnerov said:
But the main canister is a smaller diameter, so filter elements are more restricted.
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I see that the Sd1 has different size air boxes. One SD1 airbox has pancake style filter . I picked up one almost identical to my P6 airbox and filled it with RYCO A1705 filters. I had to re drill the holes on the legs where it sits on those two locating pins at the rear of the rocker cover. Everything still looks P6b except for the larger inlet port.
 
GRTV8 said:
I see that the Sd1 has different size air boxes. One SD1 airbox has pancake style filter . I picked up one almost identical to my P6 airbox and filled it with RYCO A1705 filters. I had to re drill the holes on the legs where it sits on those two locating pins at the rear of the rocker cover. Everything still looks P6b except for the larger inlet port.
Click to expand...

I think the one you have used is SD1 with SU carbs, the other is for strombergs..
 
harveyp6 said:
I think the one you have used is SD1 with SU carbs, the other is for strombergs..
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Hello Harvey. Here are the two boxes in question. P6b box on top ,SD1 in place. Virtually same size except for the inlet port. Ive got the larger filters in them now. Down here we can get RYCO A1705 .Just had to source two longer bolts to secure them inside.
 

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GRTV8 said:
Hello Harvey. Here are the two boxes in question. P6b box on top ,SD1 in place. Virtually same size except for the inlet port. Ive got the larger filters in them now. Down here we can get RYCO A1705 .Just had to source two longer bolts to secure them inside.
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Hi Graeme,

The SD1 air filter box that you have was fitted to UK market cars running SU carburettors. I don't know if NZ received these cars directly, Australia certainly did not. The SD1 models imported through Leyland Australia for the Australian market were fitted with Zenith Stromberg carburettors and separate rectangular air boxes. The SU carburettors could not achieve the tightened Australian ADR rules in terms of acceptable emissions.
Any of the large inlet air boxes found in Australia arrived most likely via private imports. The only reason for the large inlet on the SD1 was to accommodate the adjustable cool or hot air intake which heavily reduced airflow reaching the engine (see photo). As a means of improving the airflow to overcome this impediment, the size of the inlet was substantially increased. The photos below illustrates the set up for SD1 models sold in Australia from 1978 till 1981 prior to the introduction of fuel injection. Range Rovers continued with Zenith Stromberg carburettors for a few more years. The P6 models continued to be sold new in Australia until 1978 when the SD1 arrived.

Rover-sd1-3.jpg
Stromberg-CD-1s.jpg
Ron.P1080430-1979-Rover-3500-SD1-Engine-Bay.webp
 
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